<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item
        @click.native="removePath"
        :to="{ path: '/home' }"
        replace
        >首页</el-breadcrumb-item
      >
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品添加</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert
        title="添加商品信息"
        type="info"
        show-icon
        center
        :closable="false"
      >
      </el-alert>
      <!-- 步骤条区域 -->
      <el-steps
        :space="200"
        :active="activeIndex - 0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- tab栏区域 -->
      <el-form
        :rules="addFormRules"
        :model="addForm"
        label-width="100px"
        label-position="top"
        ref="addFormRef"
      >
        <el-tabs
          tab-position="left"
          v-model="activeIndex"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"> </el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"> </el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number">
              </el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number">
              </el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="catelist"
                :props="{
                  expandTrigger: 'hover',
                  label: 'cat_name',
                  value: 'cat_id',
                  children: 'children'
                }"
                @change="handleChange"
                clearable
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表的的item项 -->
            <el-form-item
              :label="item1.attr_name"
              v-for="item1 in manyTableData"
              :key="item1.attr_id"
            >
              <el-checkbox-group v-model="item1.attr_vals">
                <el-checkbox
                  :label="item2"
                  v-for="(item2, i) in item1.attr_vals"
                  :key="i"
                  border
                ></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item
              :label="item.attr_name"
              v-for="item in onlyTableData"
              :key="item.attr_id"
            >
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action表示图片要上传到的后台API地址 -->
            <el-upload
              class="upload-demo"
              :action="uploadURL"
              :headers="headerObj"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              :on-success="handleSuccess"
              list-type="picture"
            >
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4" class="one">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品的按钮 -->
            <el-button type="primary" class="btnAdd" @click="add"
              >添加商品</el-button
            >
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览对话框 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt="" class="previewImg" />
    </el-dialog>
  </div>
</template>
<script>
import _ from 'lodash'
export default {
  data() {
    return {
      // 显示当前标签和当前进度条
      activeIndex: '0',
      //   添加商品表单
      addForm: {
        goods_name: '',
        goods_price: '0',
        goods_weight: '0',
        goods_number: '0',
        // 商品所属的分类数组
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品内容
        goods_introduce: '',
        // 商品的参数
        attrs: []
      },
      //   添加商品表单验证
      addFormRules: {
        goods_name: [
          {
            required: true,
            message: '请输入商品名称',
            trigger: 'blur'
          }
        ],
        goods_price: [
          {
            required: true,
            message: '请输入商品价格',
            trigger: 'blur'
          }
        ],
        goods_weight: [
          {
            required: true,
            message: '请输入商品重量',
            trigger: 'blur'
          }
        ],
        goods_number: [
          {
            required: true,
            message: '请输入商品数量',
            trigger: 'blur'
          }
        ],
        goods_cat: [
          {
            required: true,
            message: '请选择商品分类',
            trigger: 'change'
          }
        ]
      },
      //   商品分类列表
      catelist: [],
      //   是否可以切换到下一标签页
      state: 'false',
      //   动态参数列表
      manyTableData: [],
      //   静态属性列表
      onlyTableData: [],
      //   上传图片的地址
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      previewPath: '',
      // 控制图片预览对话框的显隐
      previewVisible: false
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    //   获取商品列表数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品列表失败!')
      }
      this.catelist = res.data
    },
    // 级联选择器值变化时触发这个函数
    handleChange() {
      console.log(this.addForm.goods_cat)
    },
    // 切换标签页前的验证
    beforeTabLeave(activeName, oldActiveName) {
      if (oldActiveName == 0) {
        this.$refs.addFormRef.validate(valid => {
          if (!valid) {
            this.$message.error('验证失败!')
            this.state = false
            return
          }
          this.state = true
        })
      }
      return this.state
    },
    //tab被选中时触发的函数
    async tabClicked() {
      //   访问的是动态参数面板
      if (this.activeIndex === '1') {
        const res = await this.getParamsData('many')
        //   把参数从字符串变为数组
        res.data.forEach(item => {
          // 如果参数为空,则返回一个空数组
          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        })
        this.manyTableData = res.data
      }
      //   访问的是静态属性面板
      if (this.activeIndex === '2') {
        const res = await this.getParamsData('only')
        this.onlyTableData = res.data
      }
    },
    // 获取动态参数和静态属性的方法
    async getParamsData(activeName) {
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: { sel: activeName }
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取数据失败!')
      }
      this.$message.success('获取数据成功!')
      return res
    },
    // 处理图片预览效果
    handlePreview(file) {
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove(file) {
      //   1.获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2.从pics数组中,找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 3.调用数组的splice方法,把图片信息对象从pics数组中移除
      this.addForm.pics.splice(i, 1)
    },
    // 	文件上传成功时的钩子
    handleSuccess(response) {
      //   1.拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      //   2.将图片信息对象,push到pics数组中
      this.addForm.pics.push(picInfo)
    },
    add() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项!')
        }
        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        //   处理静态参数
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        // 因级联选择器中goods_cat是数组,提交的数据为字符串,所以把表单数据进行了深拷贝
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 发起添加商品请求
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败!')
        }
        this.$message.success('添加商品成功!')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>
<style scoped>
.el-checkbox {
  margin: 0 5px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>
